Poloniex don't do fiat, hence money, until such time as US laws treat crypto as money, which will be a constitutional nightmare.
In 2013 Silk Road was seized. Ross's lawyer argued in 2014 that Ross could not be guilty of money laundering because bitcoin is not money, but property. The Judge shoots down this argument by stating that "it's close enough to be considered money".
Ross lost the case and was sentenced for money laundering, among other things
Consequently: bitcoin is to be defined as money.